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Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (6): 816-825.doi: 10.11764/j.issn.1672-1926.2021.01.001

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Tectonic-lithofacies paleogeographic characteristics of Ordovician Kelimoli and Wulalike stages in the western edge of Ordos Basin

Zhou YU1(),Jin-gao ZHOU1,Cheng-shan LI2,Xiao-jiao SONG3,Chao LUO4,Xing-ning WU1,Dong-xu WU1,Cong HU2   

  1. 1.PetroChina Hangzhou Research Institute of Geology，Hangzhou 310023，China
    2.Exploration Department of PetroChina Changqing Oilfield Company，Xi’an 710018，China
    3.Gansu Mining Development Research Institute，Lanzhou 730000，China
    4.Chongqing University of Science ＆ Technology，Chongqing 401331，China
  • Received:2020-06-08 Revised:2020-12-29 Online:2021-06-10 Published:2021-05-24
  • Supported by:
    The China National Science and Technology Major Project(2017ZX05008005);the PetroChina Major Science and Technology Project(2018A-0105);the PetroChina Innovation Foundation(2019D-5007-0210)

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Abstract:

In order to find out the tectonic-sedimentary characteristics of the Ordovician Kelimoli-Wulalike formations in the Ordos Basin， and provide technical support for the prediction and target optimization of favorable exploration zones in this area， the paleotectonic pattern and sedimentary characteristics of the Ordovician Kelimoli-Wulalike stages in the western edge of the Ordos Basin are studied systematically under the guiding ideology of tectonic controlling deposition， based on seismic， well logging， drilling cores， microscopic thin section and outcrops. The results indicate that： （1）The paleotectonic pattern of the Kelimoli-Wulalike stages reflects the characteristics of “one land， one uplift and one depression， and high and sag alternate with each other along the northeast direction of transition zone”； （2）The deposition pattern of the Kelimoli-Wulalike stages is rimmed shelf and the types of sedimentary facies include platform edge， slope， deep-water shelf and basin； （3）The paleotectonic pattern controls the plane distribution of sedimentary facies. The platform margins are distributed along the central paleo-uplift and the NE-trending bulge on the uplift transition zone， the slope facies are mainly distributed along the NE-trending sag on the uplift transition zone； the deep-water shelf facies and basin facies are mainly distributed along the western depression.

Key words: Ordos Basin, Western edge, Ordovician Kelimoli and Wulalike Ages, Paleotectonic framework, Sedimentary facies

CLC Number: 

  • TE122.1

Fig.1

Comprehensive histogram of Ordovician strata (a), residual thickness map of Ordovician Kelimoli Formation (b) and Wulalike Formation(c) in the western edge of the Ordos Basin"

Fig.2

Seismic profile interpretation of Ordovician in the western edge of the Ordos Basin(section position as shown in Fig.1)"

Fig.3

Stratigraphic and sedimentary connected well section of Ordovician Kelimoli and Wulalike Formations of Wells L37-L69-YT1-Z8-E102(section position as shown in Fig.1)"

Fig.4

Stratigraphic and sedimentary connected well section of Ordovician Kelimoli and Wulalike Formations of Wells E102- E91- E89- E74- E30 (section position as shown in Fig.1)"

Fig.5

Sedimentary features of Ordovician Kelimoli and Wulalike Ages in the western edge of the Ordos Basin"

Fig.6

Sedimentary facies histogram of Ordovician Kelimoli and Wulalike formations in a typical single well and field section in the western edge of the Ordos Basin"

Fig.7

Lithofacies palaeogeography map of Ordovician Kelimoli（a） and Wulalike(b) Ages in the western edge of the Ordos Basin"

Fig.8

Sedimentary evolution of Ordovician Kelimoli and Wulalike Ages in the western edge of the Ordos Basin(section position as shown in Fig.1)"

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